Download or read book Effect of Grain Size on Creep Properties of a Tungsten written by Robert J. Buzzard and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA TN D 6285 written by Robert J. Buzzard and published by . This book was released on 1971 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Grain Size on Creep Properties of a Tungsten 25 atomic percent thenium 30 atomic percent molybdenum Alloy from 1800 to 4000 F 982 to 2204 written by Robert J. Buzzard and published by . This book was released on 1971 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Grain Size on Creep Properties of a Tungsten 25 atomic percent rhenium 30 atomic percent molybdenum Alloy from 1800 to 4000 Degrees F 982 to 2204 Degrees C written by Robert J. Buzzard and published by . This book was released on 1971 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Purity and Structure on Recrystallization Grain Growth Ductility Tensile and Creep Properties of Arc melted Tungsten written by William D. Klopp and published by . This book was released on 1964 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Properties and Recrystallization Behavior of Electron beam melted Tungsten Compared with Arc melted Tungsten written by William D. Klopp and published by . This book was released on 1966 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been conducted of the properties of tungsten fabricated from three ingots consolidated by electron-beam melting. The study included purity as a function of number of melts, recrystallization a d grain growth behavior, low-temperature ductility, and high-temperature tensile and creep strength. The level of most metallic impurities in tungsten decreased with increasing number of electron-beam melts, the reduction being greatest for aluminum, iron, nickel, and silicon. The levels of interstitial impurities generally were not affected by remelting. Resistivity ratios for single crystals machined from ingot slices tended to increase on remelting. The recrystallization rates for worked, electron-beam- melted (EB-melted) tungsten were significantly higher than those observed earlier for arc-melted tungsten. The grain growth rates of EB-melted tungsten were higher than those reported previously for arc-melted tungsten, further reflecting the higher purity of the EB-melted materials. The activation energies for both recrystallization and grain growth in EB-melted tungsten were consistent with expected values assuming grain boundary self-diffusion to be the rate-controlling reaction. The ductile-brittle bend transition temperature for EB-melted tungsten is slightly higher in the worked condition than that reported for arc-melted tungsten. In the recrystallized conditions, the transition temperatures for EB- and arc-melted tungsten are similar. The tensile strength of EB-melted tungsten at 2500 to 4000 F is less than that of arc-melted tungsten. This is partly associated with the large grain size of EB-melted tungsten. However, when compared at the same grain size,
Download or read book NASA Technical Note written by and published by . This book was released on 1971 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Properties of a Tungsten 23 4 percent rhenium 0 27 percent hafnium Carbon Alloy written by William D. Klopp and published by . This book was released on 1971 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Grain Size and Impurities on Tensile Strength and Ductility of Tungsten from 2500 to 5000 F in Vacuum written by J. L. Taylor and published by . This book was released on 1964 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High temperature Tensile Properties of Wrought Sintered Tungsten written by Paul F. Sikora and published by . This book was released on 1959 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Effects of Annealing and Grain Size in Powder metallurgy Tungsten written by Friedrich G. Ostermann and published by . This book was released on 1963 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical properties of powder-metallurgy tungsten were studied at low temperatures. Particular emphasis was placed on the effects of annealing temperatures and grain size on the ductile-brittle transition behavior. While room-temperature hardness and grain size were little sensitive to temperature changes within the 1500 to 2300 C range, tensile behavior was markedly influenced. Variation of grain size was achieved by straining and annealing. Grain size effects were evaluated in terms of the Petch-analysis. Fracture was at all times predominantly intergranular. The results of this investigation suggest that the high ductile-brittle transition temperature of tungsten is not sufficiently explained by strong dislocation-impurity atom interaction.
Download or read book Effects of Interstitial Impurities on the Low temperature Tensile Properties of Tungsten written by Joseph R. Stephens and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was undertaken to determine the effects of the interstitial impurities oxygen and carbon on the mechanical properties of polycrystalline tungsten and high-purity tungsten single crystals. Results of tensile tests showed that additions of both oxygen and carbon to polycrystalline tungsten produced a marked increase in the ductile to brittle transition temperature. Oxygen and carbon produced a much smaller increase in the transition temperature of the single-crystal specimens compared with equivalent amounts of impurities in the polycrystalline specimens. Addition of oxygen to polycrystalline tungsten lowered both the ultimate tensile strength and the yield strength, but had no measurable effect on the strength properties of single-crystal specimens. Carbon additions to both polycrystalline and single-crystal specimens did not affect the ultimate tensile strength; however, a large increase in the yield strength resulted. The results suggest that oxygen embrittlement in tungsten is caused by grain-boundary segregation, while carbon embrittlement results from an interaction between carbon atoms and dislocations within the tungsten lattice.
Download or read book Influence of Boron Additions on Physical and Mechanical Properties of Arc melted Tungsten and Tungsten 1 Percent Tantalum Alloy written by Peter L. Raffo and published by . This book was released on 1966 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of boron additions on the physical and mechanical properties of arc-melted tungsten and a tungsten -1 percent tantalum alloy were investigated. Boron additions significantly refined the arc-melted grain size of tungsten. The 1-hour recrystallization temperature was initially increased by small boron additions (approx. 0.01 atomic percent boron), after which it decreased continuously with increasing boron content. High-temperature tensile tests showed that the boron additions produced an initial rapid rise in strength followed by a leveling off of the strength-composition curve. Boron in solid solution was postulated to be the cause of the rapid increase in strength.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1980 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Refractory Metal Alloys Metallurgy and Technology written by I. Machlin and published by . This book was released on 1968 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
